• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Summary of the Patent for: DRILLING DRILL. Drill bit (1) is suggested, having a tool shank (3), a central axis (5), a first cutting region (7) with at least one geometrically defined first cutting edge (9; 9), the same having a cutting face (23), arranged at a radial distance from the central axis (5) of the drill bit (1), in which the first cutting edge forms a point angle (a) with the central axis. The drill bit (1) is characterized by the fact that a chip shaping stage is functionally assigned to the first cutting edge (9; 9), formed by the cutting face (23) of the first cutting edge (9; 9) and a shoulder surface (31) contiguous with the cutting face (23) and forming a shoulder angle (d) with it, where the shoulder angle (d) is greater than 90 ° and, preferably, greater than 100 °, where the cutting face (23) extends at an angle of radial inclination (e) with respect to an imaginary radial line (L), which cuts the first cutting edge (9), the same functionality assigned to the cutting face (23) and where the radial inclination angle (e) is positive.
    公开号:BR112014023408B1
    申请号:R112014023408-6
    申请日:2013-03-20
    公开日:2020-07-28
    发明作者:Ulrich Krenzer
    申请人:MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG；
    IPC主号:
    专利说明:

    [0001] The invention relates to a drill bit according to the preamble of claim 1 and also to the use of that drill bit according to claim 13.
    [0002] When materials are machined by means of a drill bit claimed here, chip formation is generally controllable during drilling, even in the case of long chip materials. The chips are broken into short segments and transported safely as individual helical chips away from the cutting edge of the drill bit. In undercut applications, long strip chips are usually formed when long chip materials are machined, often wrapping around the tool and making further use impossible. In this case, there is a risk that the drill bit will break and the workpiece will be damaged. In order to prevent the formation of these chips, the advance of the drill bit is stopped briefly or inverted, in many cases, when machining a workpiece. However, this leads to longer machining times and increased wear as a result of alternating loads on the drill bit. If the drill bit is designed as a phase drill - that is, a combination of a solid drill bit and a countersunk bit in a single tool, the chips laminated by the cutting edges of the solid bits and the cutting edges of the Recessed drills often entangle each other and form a ball, which often leads to tool breakage or damage to the cutting edges.
    [0003] The problem addressed by the invention, therefore, is to create a drill bit of the type claimed above, in which the formation of long shavings or the formation of shavings is prevented to the greatest degree possible, even when machining. long chip materials.
    [0004] To address this problem, a drill bit having the characteristics of claim 1 is proposed. This drill bit has a tool shank with a first cutting region, having at least one first geometrically defined cutting edge with a face associated cutting edge, said tool shank forming a recess angle with a central axis of the drill bit. The drill bit is characterized by the fact that a chip shaping stage is functionally assigned to the first cutting edge, preventing the formation of long chips and the creation of chip balls. The chip shaping stage is formed by the cutting face of the first cutting edge and a shoulder surface contiguous to the cutting face, and forming a shoulder angle with the cutting face. The shoulder face, in this case, is arranged at an acute angle of inclination with respect to the central axis, said cutting angle being greater than 90 ° and, preferably, greater than 100 °, so that these laminated chips by the first cutting edge they are deflected by the chip shaping stage towards the central axis of the drill bit. In addition, the drill bit is also characterized by the fact that the cutting angle of the cutting face, measured orthogonal to the main cutting edge of the first cutting edge, is positive. This leads to a reduction in cutting forces.
    [0005] An embodiment of the drill bit is particularly preferred, in which the cutting angle of the shoulder surface of the chip shaping stage is configured to be in a range of -10 ° to + 10 ° and, preferably, of -5o to + 5 °.
    [0006] Another preferred embodiment is characterized by the fact that the rebound angle is configured to be larger in inverse proportion to the recess angle. In this way, it is easy to influence the size and shape of the chips created when machining a workpiece. In particular, it is possible to prevent long shavings and the formation of balls.
    [0007] A particularly preferred embodiment is characterized by the fact that a second cutting region is included, having at least one second cutting edge geometrically defined, so that the drill bit can be used as a phase drill bit or a recess drill. In this case, the second cutting region is arranged on the end face of the drill bit and the first cutting region is arranged at a distance from it, measured axially, along the central axis. In this case, the machining diameter of the second cutting region is smaller than that of the first cutting region. In this embodiment, too, the chip shaping stage ensures that long shavings and shavings are prevented, even when long shavings are machined.
    [0008] Additional embodiments are found in the dependent claims.
    [0009] The problem is also directed to the use of this drill bit as a recess tool or stepped hole.
    [0010] The invention is described in more detail below with reference to the drawings, in which:
    [0011] Figure 1 shows a first embodiment of a drill bit in a side view;
    [0012] Figure 2 shows the drill bit according to Figure 1 in a second side view significantly enlarged;
    [0013] Figure 3 shows the drill bit according to Figures 1 and 2 in cross section, along line III -III, shown in Figure 2; and
    [0014] Figure 4 shows a second embodiment of the drill bit in a side view.
    [0015] Figure 1 illustrates a first embodiment of a drill bit 1 particularly its front end region. It has a tool shank 3 which is broken at its left end. It can be coupled to a support directly or via a known support shaft, in the conventional manner. A relative rotation occurs between the workpiece and the drill bit when the drill bit is operated - that is, when machining a workpiece. The drill bit 1 is typically coupled to a tool spindle, which also serves as a support - either directly or via intermediate elements, said tool spindle being made to rotate, so that the rotary drill bit 1 can be snapped into place with a fixed workpiece in order to produce a bored or recessed hole and / or create a stepped hole. The drill bit 1 rotates about its central axis 5 when machining the workpiece.
    [0016] The drill bit 1 illustrated in Figure 1 has a first cutting region 7 with at least one first cutting edge 9 geometrically defined, which is arranged at a distance from the central axis 5 radially, thus defining a flight circle of the first cutting edge 9 and therefore a machining diameter of a hole.
    [0017] The drill bit 1, according to Figure 1, has a second cutting region 11, which also has at least one second cutting edge 13, defined geometrically. The radial distance of the second cutting edge 13 from the central axis 5 is less than the radial distance of the first cutting edge 9, so that there is a smaller machining diameter in the second cutting region 11 than is produced in the first cutting region. cut 7.
    [0018] Figure 1 shows that the second cutting region 11 is arranged on the end face 15 of the drill bit 1 and the first cutting region 7 is arranged at a distance of the same measure axially along the central axis 5.
    [0019] If drill bit 1, shown in Figure 1, is used to machine a workpiece, the second cutting region 11 makes the first engagement with the workpiece, on the end face 15 of the drill bit. By further advancing the drill bit 1 towards the central axis 5, the first cutting region 7 also fits into the workpiece, so that the hole produced by the second cutting region 11 is machined by the first cutting region. cut 7. The hole produced by the second cut region 11 is recessed by the first cut region 7, which - as mentioned above - has a larger machining diameter.
    [0020] The second cutting region 11 on the end face 15 of the drill bit can be designed in such a way that the drill bit 1 can be used to drill in solid material. However, it can also be considered that an existing hole is lowered through the second cutting region 11 and a further widening of the bore diameter is achieved through the first cutting region 7. If the drill bit 1 is guided completely through of a workpiece, both the second cutting region 11 and the first cutting region 7 therefore fit across the entire length of a hole in a workpiece. As such, a hole is recessed in a workpiece by means of the drill bit 1 illustrated here.
    [0021] However, it can also be considered that the drill bit 1 is made to rotate around its central axis 5 and to machine a workpiece without the drill bit 1 being guided completely through it. In this way, a hole with a first diameter is produced or machined through the second cutting region 11 and that hole is recessed through the first cutting region 7, so that a segment of the hole is created, which has a diameter larger internal diameter than is found in the hole region that was machined through the second cutting region 11. In this case, drill bit 1 is used as a stepped drill bit.
    [0022] When a hole is machined, the drill bit 1 is supported by at least one guide chamfer. In the embodiment illustrated here, a first guide chamfer 17 is included, connecting to the first cutting region 7, and a second guide chamfer 19 is included for the second cutting region 11. At least one guide chamfer is included, preferably for each cutting edge included in the cutting regions, where the drill bit 1 is supported on the inner surface of a hole through said guide chamfer.
    [0023] In order to increase the machining speed and in order to better distribute the cutting forces developed in the drill bit 1, two paired cutting edges, arranged opposite each other, are configured in each of the first region of cut 7 and the second cut region 11. A first cut edge 9 can be seen in Figure 1 at the top, in the first cut region 7, to which a cut edge 9 'with an identical opposite design is functionally and below from the central line 5.
    [0024] As a result, an identical cutting edge 13 'is configured diametrically opposite the second cutting edge 13, in the second cutting region 11.
    [0025] Since the two opposite cutting edges in the first and second cutting regions have identical designs, the text directs only one of these in each case below.
    [0026] Figure 1 also shows that the drill bit 1 preferably has a lubricant cooling / feeding means and that at least one opening 21 is configured in the end face 15 of the drill bit 1, in which the means cooling / lubricant may come out of it. Another opening is preferably included diametrically opposite to opening 21. The number of openings is preferably matched to the number of cutting edges in each cutting region.
    [0027] The side view shown in Figure 1 shows that the first cutting edge 9 has a cutting face 23, in which the chips laminated by the cutting edge 9 come out of it. A surface 25 runs at an angle and connects to the cutting face 23. In the conventional way, the first cutting edge 9 has a cutting edge segment - the main cutting edge - which, in Figure 1, is oriented towards the right -that is, in the direction in which the drill advances - as well as a cutting edge segment - the smaller cutting edge - which is turned radially outwards with respect to the central axis 5 - that is, along the periphery. The chips laminated by these two cutting edge segments come out of them towards the cutting face 23.
    [0028] The chips laminated by the first cutting edge 9 move in a first chip groove 27 and are transported out of the first cutting region 7 through it. The same chip groove also guides chips that are laminated from a workpiece by the second cutting edge 13 'away.
    [0029] As a result, the chips that are laminated by the first cutting edge 9 'opposite the first cutting edge 9, are guided out of the machining site through a second chip groove 29 and this also guides the chips away which are laminated by the second cutting edge 13.
    [0030] It can be seen that the chip grooves 27 and 29, in the embodiment of the drill bit 1 illustrated here, each guide away the chips that are laminated by the cutting edges 9, 9 'or 13, 13' of the first and second cut regions 7 or 11, as may be the case.
    [0031] The illustration chosen here makes it clear that the first cutting edge 9, like the opposite cutting edge 9 ', forms an angle with the central axis 5 - also indicated as a recess angle a. It can be seen that a hole in a workpiece, which is machined or produced by means of the second cutting region 11 during the machining of a workpiece, can be widened by the radial depth of cut A -that is, up to the size of a segment that results from the fact that the radial distance of the first cutting edge 9 from the central axis 5 is greater than the radial distance of the second cutting edge 13 from the central axis 5.
    [0032] Figure 2 shows, once again, the first embodiment of the drill bit 1 in a significantly enlarged side view. However, this view is rotated with respect to the illustration in Figure 1, so that the first cutting edge 9 of the first cutting region 7 now faces the viewer.
    [0033] Below, identical and functionally identical parts are indicated by the same reference numbers, so that attention is hereby directed to the description referring to Figure 1 in order to avoid repetition.
    [0034] In Figure 2, also, the cutting face 23 of the first cutting edge 9 can be seen, as well as the contiguous surface 25 that forms an angle with the cutting face 23.
    [0035] Shavings laminated by the first cutting edge 9 of the first cutting region are removed through the cutting face 23 and move in the associated chip groove 27, which also receives chips that are laminated from a workpiece by the second cutting edge. cutting 13 'of the second cutting region 11. As a result, the chip groove 29 receives the chips from the first cutting edge 9' and the second cutting edge 13, as mentioned above.
    [0036] It can be seen in Figure 2 that the cutting face 23 from the first cutting edge 9 is arranged at an angle with respect to the central axis 5, said angle indicated as the axial cutting angle p. It is clear that the cut face 23, in this case, is pivoted counterclockwise with respect to a reference line that extends parallel to the central axis 5. As a result, the configuration here has a cut angle negative axial p.
    [0037] In the embodiment of the drill bit 1 illustrated in Figures 1 and 2, the chip grooves 27 and 29 have a helical design and form a helix angle y with the central axis 5, as can be seen in Figure 2.
    [0038] Figure 3 shows the drill bit 1 according to Figure 2 in cross section, in which its cutting plane extends along the line III-III represented in Figure 2. Identical and functionally identical parts are indicated by the same reference numbers, so that attention can be directed to the above description with reference to the figures, in order to avoid repetition.
    [0039] The first cutting edge 9 of the first cutting region 7 can be seen on the left in the cropped view. Diametrically opposite is the first cutting edge 9 'of the first cutting region 7', with an identical design.
    [0040] The cutting face 23 functionally assigned to the first cutting edge 9 joins the first cutting edge 9 - extending in the plane of the image in Figure 3 - extending in parallel to an imaginary horizontal diameter line H in the cropped view illustrated here. Said cutting face makes the transition on a shoulder 31, forming an obtuse angle õ with the cutting face 23 - called the shoulder angle. A chip shaping stage is formed by the cutting face 23 and the contiguous shoulder surface 31, in which short, defined shavings are created by the same when machining a workpiece. The width BS of the shoulder surface 31 'is indicated for the cutting edge region 9' in Figure 3 by means of two reference lines. As the first cutting edges 9 and 9 ', as well as the associated surfaces, are identical, the width BS of the boss surface 31 is identical to that of the boss surface 31'. Figure 3 also illustrates the chip grooves 27 and 29.
    [0041] It can be seen in Figure 3 - in an explanation referring here to the first cutting edge 9 '- that the cutting face 23 forms an angle - indicated as the radial cutting angle (s) - together with a reference line radial L, the same proceeding from the central axis 5, extending perpendicular to the plane of the image in Figure 3 and intersecting the tip of the cutting edge 9 'in the radial position furthest outwards. The cutting face 23 of the first cutting edge 9 is preferably arranged in such a way that it results in a positive radial cutting angle (£).
    [0042] Figure 3 also illustrates two cooling means / lubricating channels 35 and 35 ', which extend through the base body 33 of the drill bit 1 and end in associated openings 21 on the end face 15 of the drill bit 1 , as can be seen in Figures 1 and 2.
    [0043] Figure 4 shows a side view of a second embodiment of a drill bit, in which identical and functionally identical parts are given the same reference numbers, so that attention is directed to the description referring to Figures 1 to 3 above.
    [0044] The second embodiment of the drill bit 1 has, according to Figure 4, a tool shank 3, which is interrupted on the left. As such, there may be a support shaft or the like configured along the additional length of the drill bit 1, to torque the drill bit 1.
    [0045] The drill bit 1 has a first cutting region 7 and a second cutting region 1, which is arranged at a distance of the same measure axially along the central axis 5. The chips laminated by the first cutting edge 9 of the first cutting region 7 is removed via a third associated chip groove 37. The chips laminated by the second cutting edge 13 of the second cutting region 11 circulate out of the hole and in the associated chip groove 29. As a result, the chips laminated by the first cutting edge 9 'of the first cutting region 7 are removed through an associated fourth chip groove 39, which is covered in Figure 4, while chips laminated by the second cutting edge 13' of the second cutting region 11 circulate away through the chip groove 29, which will be covered in the drawing.
    [0046] The chips from the two cutting regions 7, 11 cannot therefore interfere with each other.
    [0047] Therefore, it is an essential feature of this embodiment that the separate chip grooves 37, 39 and 27, 29 are functionally assigned to the first cutting region 7 and the second cutting region 11.
    [0048] Figure 4 also shows that the drill bit 1 illustrated in this case has multiple guide chamfers - particularly two guide chamfers 17/1 and 17/2 facing the viewer, and also corresponding guide chamfers 17 '/ I and 17' / 2 on the reverse side of the drill bit 1, facing away from the observer, in part not visible, in this case. As such, there are four guide strips included in this embodiment.
    [0049] In the embodiment illustrated in Figure 4, also, the drill bit 1 has a second cutting region 11 with at least a second cutting edge 13.
    [0050] The embodiment illustrated here has -as in the embodiment described above, a cutting edge 9 'opposite the first cutting edge 9 and a cutting edge that is opposite the second cutting edge 13, which is covered. Therefore, the first and second cutting edges, positioned opposite each other in pairs, are configured in the first and second cutting regions.
    [0051] Another difference between the embodiment illustrated in Figure 4 and the embodiment described above is that the axial distance - measured, that is, along the central axis 5 - is smaller between the first cutting region 7 and the second cutting region 11.
    [0052] Figure 4 illustrates, in addition to the cutting face 23, the boss surface 31, which forms a chip shaping stage together with the boss face 23, said chip shaping stage being functionally attributed to the first cutting edge 9. A corresponding chip shaping stage is configured on the first opposite cutting edge 9 '.
    [0053] The shoulder surface 31 preferably forms an angle 0 with an imaginary horizontal line, opening to the left in Figure 4 -as seen from the terminal face. In other words, the shoulder surface 31 extends at an acute angle of inclination 0 with respect to the central axis 5. This design ensures that the chips laminated by the first cutting edge 9 are guided and deflected in the direction of the central axis 5.
    [0054] This inclination of the shoulder surface 31 is also preferably present in the first embodiment, the same having been explained with reference to Figures 1 to 3.
    [0055] The distance between the edge radially out of the first cutting edge 9 (at the top in Figure 4) and a horizontal reference line HL - measured radially from the central axis 5, is defined as the radial cutting depth A This is also shown in Figure 1.
    [0056] The radial depth of cut A indicates the extent to which a hole machined or produced using the second cutting region 11 is widened by machining the hole through the first cutting region 7.
    [0057] In the embodiment illustrated in Figure 4, likewise, the second cutting region 11 on the end face 15 of the drill bit 1 can be designed in such a way that the drill bit 1 can be used to drill on solid material. However, it can also be considered that the second cutting region 11 is designed in such a way that it is used for the purpose of lowering an existing hole. As such, the existing hole is lowered through the second cutting region 11.
    [0058] If the drill bit 1 according to Figures 1 to 3 and according to Figure 4 is guided completely through a workpiece being machined, the second cutting region 11 and the first cutting region 7 work as recesses. If the drill bit 1 is only inserted into the workpiece over a shorter stroke, a hole is produced and / or enlarged by the second cutting region 11 and it is further enlarged by the second cutting region 11 to the extent the radial depth of cut A. A stepped hole results in this case.
    [0059] As such, it is possible to use the drill bit 1 described here as a stepped hole or recess tool.
    [0060] Particularly, when long chip materials are machined, the laminated chips of the material are broken by the chip shaping stage implemented by the cut face 23 and the adjacent shoulder surface 31, so that short, defined chips are created, which can be removed as such through the chip grooves 27 and 29 of the drill bit 1.
    [0061] It is essential that the drill bit 1 can also be designed exclusively with a first cutting region 7 and with at least one associated first cutting edge 9 of a first cutting region 7, where the second cutting region 11 with at least one of the second cutting edge 13 is completely dispensed. In that case, the end face resulting from the drill bit 1 can be designed in such a way that the first cutting region 7 extends an existing hole, thus forming a stepping step, or in such a way that the drill bit 1 can drill in solid material.
    [0062] However, it can also be considered that this drill bit, having only the first cutting region 7 and no second cutting region 11 is used when machining a workpiece in such a way that it is not guided completely through it , but otherwise, just widen an existing hole in a defined area. When the drawdown process is finished, a step is created, which has an internal diameter that is larger than the hole to be machined. In this way, a stepped hole is created.
    [0063] Even in a configuration that dispenses with the second cutting region 11, the chip shaping stage formed by the cutting face 23 of the first cutting edge 9 and the adjacent shoulder surface 31 is of decisive significance, because the laminated chips in the first cutting region 7 they are broken by the same - including, and particularly, when long chip materials are machined - so that the chips can be removed directly through the chip grooves 27 and 29.
    [0064] The chip shaping stage is decisive for the positive properties of the drill bit 1, as illustrated in Figures 1 to 4 or of a drill bit without a second cutting region, in which the projection surface 31 of said chip shaping stage extends at an acute angle of inclination 0 with respect to the central axis 5 of the drill bit 1, so that the chips removed by at least one of the first cutting edge 9 and / or also of a first edge identical cutting edge 9 'opposite it, are deflected in the direction of the central axis 5.
    [0065] With respect to at least one of the first cutting edge 9, the configuration is maintained in that it has a first cutting segment oriented in the forward direction, said cutting segment being called the main cutting edge , and a second cutting segment which is located on the peripheral surface of the drill bit 1. It is particularly preferred that the cutting angle of the cutting face 23, when measured orthogonal to that main cutting edge of the first cutting edge 9 , be positive, because in this way the cutting forces are reduced and good surface properties are created for the hole after machining.
    [0066] Figure 3 also shows that the radial cutting angle € is preferably positive. Particularly good machining results have been demonstrated when the radial cutting angle s is at least 10 °.
    [0067] Good machining properties, when using the drill bit 1 described here, were particularly established when the width BS of the boss surface 31, as illustrated in Figure 3, constitutes at least 25% of the radial depth of cut A, the which can be seen in Figures 1 and 4.
    [0068] The shoulder angle õ formed between the cutting face 23 and the shoulder surface 31 is chosen so that it is greater than 100 °, on the one hand, while, on the other hand, it is less than the difference between 180 ° and the tip angle a. That is, the shoulder surface õ is preferably selected so that the following is true: 100 ° <õ d 180 °.
    [0069] In the drill bit 1 according to the invention, as illustrated in Figures 1 to 4, or in a drill bit without the second cutting region 11, the following has been demonstrated for a tip angle of less than 90 °: chips that are laminated through at least one of the first cutting edge 9 are transported more forcefully towards the central axis 5 in proportion to how negative the axial cutting angle 3 and how positive the radial cutting angle s.
    [0070] In a particularly preferred embodiment, a shoulder angle δ of 135 ° provides a point angle a of 45 °, a radial cutting angle s of + 15 ° and an axial cutting angle p of -2o. In this way, it is possible to create particularly short shavings, even when long shavings are machined using the drill bit claimed here. A drill bit of the type claimed here is preferably designed, in a particularly preferred way, with a shoulder surface 31, having a cutting angle 0 as shown in Figure 4 in the range between -10 ° <0 <+ 10 ° . It is particularly preferred that a cutting angle 0 is in the range between -5o <0 <+ 5 °.
    [0071] Bounce angles õ in a range between 100 ° <õ <160 ° have also been shown to be particularly favorable.
    [0072] In combination with the bounce angle 0, the following relationship is preferably observed: the smaller the point angle a, the larger the bounce angle 5, so that long chips are safely prevented.
    [0073] The chip molding stage described here, formed by the cut face 23 and the shoulder surface 31, also leads - and particularly in the machining of long chip materials - to the deflection of the laminated chips by the first cutting region 7 and / or at least one of the first cutting edge 9 in the direction of the central axis 5, such that defined short shavings are created and elongated shavings, which could be wrapped around the drill bit 1, are not created.
    [0074] Therefore, this advantage is not only perceived in the embodiments of a drill bit 1, illustrated in Figures 1 to 3, but also in a drill bit according to Figure 4, which is modified, in comparison with any one of these illustrations and that it has only a single cutting region - particularly the first cutting region 7 with at least one cutting edge 9. In the embodiments of a drill bit 1 described with reference to Figures 1 to 4, the molding stage of shavings explained here have particularly advantageous effects, because -particularly in the recess and in the production of stepped holes in workpieces made of long-shavings materials -long shavings are typically formed and often entangle in a compact ball. This leads to the breaking of at least one of the first cutting edge or even the breaking of the drill bit 1. This disadvantage is certainly avoided by the chip shaping stage explained here.
    权利要求:
    Claims (8)
    [0001]
    1. Drill bit comprising: -a tool shank (3); -a central axis (5); -a first cutting region (7) with at least one first geometrically defined cutting edge (9; 9 '), having a cutting face (23), arranged at a radial distance from the central axis (5) of the drill bit (1), where: -the first cutting edge (9; 9 ') forms a point angle (a) with the central axis (5), -a second cutting region (11) with at least one second edge geometrically defined cutting edge (13; 13 '), having a cutting face, arranged at a radial distance from the central axis (5); wherein the second cutting region (11) is arranged on the end face (15) of the drill bit (1) and the first cutting region (7) is arranged at a distance from it - measured axially along the central axis ( 5); wherein the radial distance of the second cutting edge (13; 13 ') from the central axis (5) is less than the radial distance of the first cutting edge (9, 9') from the central axis (5) ; the drill bit comprising one of: -a first chip groove (27) and a second chip groove (29) are included, in which the chips that are laminated by the first cutting edge (9) of the first cutting region ( 7) and the chips that are laminated by the second cutting edge (13 ') of the second cutting region (11) are removed by the first chip groove (27), and the chips from the first cutting edge (9'), as well like the chips of the second cutting edge (13), they are removed by the second chip groove (29); or -a first chip groove (27) and a second chip groove (29) are included and functionally assigned to the second cutting region (11) and in which a third chip groove (37) and a fourth chip groove (39) are included, the same being functionally assigned to the first cutting region (7), where the chips that are laminated by the first cutting region (7) and the chips that are laminated by the second cutting region (11) are removed in separate chip grooves, the drill bit further comprising: -a chip shaping stage is functionally assigned to the first cutting edge (9; 9 '), formed by the cutting face (23) of the first cutting edge ( 9; 9 ') and a shoulder surface (31) contiguous to the cutting face (23) and forming a shoulder angle (õ) with it, where the cutting face (23) extends at an angle of radial cut (s) with respect to an imaginary radial line (L), which cuts the first cutting edge (9 '), the same functionality attributed to the cutting face (23), the drill bit characterized by the fact that: -the cam angle (õ) is greater than 90 ° and, preferably, greater than 100 °; -the radial cutting angle (s) is positive, and the cutting face (23) of the chip shaping stage is arranged with an inclination that forms an axial cutting angle (p) with respect to the central axis (5), and the axial cutting angle (3) is negative.
    [0002]
    2. Drill bit according to claim 1, characterized by the fact that the cutting angle (0) of the boss surface (31) of the chip shaping stage is configured to have a value in the range of -10 ° <0 <+ 10 ° and preferably -5o <0 <+ 5 °.
    [0003]
    3. Drill bit according to claim 1 or 2, characterized by the fact that the first cutting region (7) has an inclination that forms a point angle (a) with respect to the central axis (5), where at <45 °.
    [0004]
    Drill bit according to any one of claims 1 to 3, characterized in that the cam angle (õ) is configured in a range of 100 ° <õ d 160 °.
    [0005]
    Drill bit according to any one of claims 1 to 4, characterized in that the radial cutting angle (e) is minus 10 °.
    [0006]
    Drill bit according to any one of claims 1 to 5, characterized in that the width (BS) of the boss surface (31) constitutes at least 25% of the radial depth of cut (A).
    [0007]
    Drill bit according to any one of claims 1 to 6, characterized in that the following is true for the cam angle (õ): 100 ° <õ <180 °.
    [0008]
    8. Use of a drill bit, as defined in any of claims 1 to 7, characterized by the fact that it is like a stepped hole or recess tool.
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    JP2014079814A|2014-05-08|Boring tool
    同族专利:
    公开号 | 公开日
    EP2830799A1|2015-02-04|
    KR102082123B1|2020-02-27|
    KR20140138759A|2014-12-04|
    CN104245196A|2014-12-24|
    MX352594B|2017-11-30|
    US9833843B2|2017-12-05|
    CN104245196B|2016-10-12|
    PL2830799T3|2017-12-29|
    EP2830799B1|2017-07-19|
    JP6228184B2|2017-11-08|
    JP2015511543A|2015-04-20|
    DE102012012479A1|2013-09-26|
    MX2014011177A|2014-11-14|
    US20150093205A1|2015-04-02|
    IN2014MN01818A|2015-07-03|
    WO2013143936A1|2013-10-03|
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    FR2552694B1|1983-09-29|1986-04-18|Dassault Avions|HIGH PRECISION FOREST|
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    DE102010027203A1|2010-07-06|2012-01-12|MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG|Drill bit for manufacturing holes in workpiece made of e.g. glass-fiber reinforced plastic, has splinter groove partially formed on minor cutting edges such that rake angle of minor cutting edges is enlarged in region of groove|
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    EP2799171B1|2011-12-27|2017-02-01|Sumitomo Electric Industries, Ltd.|Drill|CN104607700A|2015-02-02|2015-05-13|苏州阿诺精密切削技术股份有限公司|Step hole forming drill|
    JP6556229B2|2015-05-28|2019-08-07|京セラ株式会社|Drill and cutting method|
    US10441297B2|2015-05-29|2019-10-15|Zimmer, Inc.|Sounder for sizing bone implant|
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    DE102016214386A1|2016-07-14|2018-01-18|MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG|Step drills|
    DE102016221363A1|2016-09-09|2018-03-15|MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG|Drilling tool and method for making holes|
    EP3401042B1|2017-05-11|2020-07-22|Sandvik Intellectual Property AB|Drill body and drill|
    CN107262785B|2017-06-14|2019-05-17|东莞艾瑞克精密工具有限公司|A kind of apex point and the aperture knife tool with apex point|
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    KR102033483B1|2018-01-15|2019-10-17|주상철|a rotary cutting tool including a chip braker for preventing the occurrence of long chip|
    EP3536432B1|2018-01-22|2021-08-25|OSG Corporation|Step drill and manufacturing method for a step drill|
    DE202018103219U1|2018-06-08|2019-06-12|Zcc Cutting Tools Europe Gmbh|drilling|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-05-19| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-07-28| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/03/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    2022-01-11| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 9A ANUIDADE. |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102012005919|2012-03-26|
    DE102012005919.1|2012-03-26|
    DE102012012479.1|2012-06-22|
    DE102012012479A|DE102012012479A1|2012-03-26|2012-06-22|drill|
    PCT/EP2013/055796|WO2013143936A1|2012-03-26|2013-03-20|Drill|
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